If you hold the jump button (On Keyboard or controller), the player continues to jump, even while the inventory is opened. This did not happen in earlier versions, and was not listed as a feature, so i would assume it is a bug.
Linked issues
Comments
[Mod] Celesian
migrated
Thank you for your report!
We're already tracking this issue at MCPE-54571, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated. If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links: 📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki